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X22C10
256 Bit
X22C10
Nonvolatile Static RAM
64 x 4
FEATURES
High Performance CMOS
—120ns RAM Access Time
High Reliability
—Store Cycles: 1,000,000
—Data Retention: 100 Years
Low Power Consumption
—Active: 40mA Max.
—Standby: 100µA Max.
Infinite Array Recall, RAM Read and Write Cycles
Nonvolatile Store Inhibit: VCC = 3.5V Typical
Fully TTL and CMOS Compatible
JEDEC Standard 18-Pin 300-mil DIP
100% Compatible with X2210
—With Timing Enhancements
DESCRIPTION
The X22C10 is a 64 x 4 CMOS NOVRAM featuring a
high-speed static RAM overlaid bit-for-bit with a non-
volatile E2PROM. The NOVRAM design allows data to
be easily transferred from RAM to E2PROM (STORE)
and from E2PROM to RAM (RECALL). The STORE
operation is completed within 5ms or less and the
RECALL is completed within 1µs.
Xicor NOVRAMs are designed for unlimited write opera-
tions to the RAM, either RECALLs from E2PROM or
writes from the host. The X22C10 will reliably endure
1,000,000 STORE cycles. Inherent data retention is
greater than 100 years.
FUNCTIONAL DIAGRAM
NONVOLATILE E2PROM
MEMORY ARRAY
A0
A1
A2
STORE
RECALL
I/O1
I/O2
I/O3
I/O4
ROW
SELECT
CONTROL
LOGIC
INPUT
DATA
CONTROL
CS
WE
STATIC RAM
MEMORY ARRAY
COLUMN
I/O CIRCUITS
COLUMN SELECT
A3 A4 A5
PIN CONFIGURATION
PLASTIC DIP
CERDIP
STORE
ARRAY
RECALL
VCC
VSS
NC
A4
A3
A2
A1
A0
CS
VSS
STORE
1 18
2 17
3 16
4 15
5 X22C10 14
6 13
7 12
8 11
9 10
VCC
NC
A5
I/O4
I/O3
I/O2
I/01
WE
RECALL
3815 FHD F02
3815 FHD F01
A4
A3
A2
A1
A0
CS
VSS
STORE
SOIC
1 16
2 15
3 14
4 13
X22C10
5 12
6 11
7 10
89
VCC
A5
I/O4
I/O3
I/O2
I/O1
WE
RECALL
3815 FHD F08.1
© Xicor, Inc. 1991,1995 Patents Pending
3815-2.4 7/26/96 T0/CO/D3 SH
1 Characteristics subject to change without notice

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X22C10
PIN DESCRIPTIONS AND DEVICE OPERATION
Addresses (A0–A5)
The address inputs select a 4-bit memory location
during a read or write operation.
Chip Select (CS)
The Chip Select input must be LOW to enable read or
write operations with the RAM array. CS HIGH will place
the I/O pins in the high impedance state.
Write Enable (WE)
The Write Enable input controls the I/O buffers, deter-
mining whether a RAM read or write operation is en-
abled. When CS is LOW and WE is HIGH, the I/O pins
will output data from the selected RAM address loca-
tions. When both CS and WE are LOW, data presented
at the I/O pins will be written to the selected address
location.
Data In/Data Out (I/O1–I/O4)
Data is written to or read from the X22C10 through the
I/O pins. The I/O pins are placed in the high impedance
state when either CS is HIGH or during either a store or
recall operation.
STORE
The STORE input, when LOW, will initiate the transfer of
the entire contents of the RAM array to the E2PROM
array. The WE and RECALL inputs are inhibited during
the store cycle. The store operation is completed in 5ms
or less.
A store operation has priority over RAM read/write
operations. If STORE is asserted during a read opera-
tion, the read will be discontinued. If STORE is asserted
during a RAM write operation, the write will be immedi-
ately terminated and the store performed. The data at
the RAM address that was being written will be unknown
in both the RAM and E2PROM arrays.
RECALL
The RECALL input, when LOW, will initiate the transfer
of the entire contents of the E2PROM array to the RAM
array. The transfer of data will be completed in 1µs or
less.
An array recall has priority over RAM read/write opera-
tions and will terminate both operations when RECALL
is asserted. RECALL LOW will also inhibit the STORE
input.
Automatic Recall
Upon power-up the X22C10 will automatically recall
data from the E2PROM array into the RAM array.
Write Protection
The X22C10 has three write protect features that are
employed to protect the contents of the nonvolatile
memory.
• VCC Sense—All functions are inhibited when VCC is
<3.5V typical.
• Write Inhibit—Holding either STORE HIGH or
RECALL LOW during power-up or power-down will
prevent an inadvertent store operation and E2PROM
data integrity will be maintained.
• Noise Protection—A STORE pulse of typically less
than 20ns will not initiate a store cycle.
PIN NAMES
Symbol
A0–A5
I/O1–I/O4
WE
CS
RECALL
STORE
VCC
VSS
NC
Description
Address Inputs
Data Inputs/Outputs
Write Enable
Chip Select
Recall
Store
+5V
Ground
No Connect
3815 PGM T01
2

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X22C10
ABSOLUTE MAXIMUM RATINGS
Temperature under Bias .................. –65°C to +135°C
Storage Temperature ....................... –65°C to +150°C
Voltage on any Pin with
Respect to VSS ....................................... –1V to +7V
D.C. Output Current ............................................ 5mA
Lead Temperature
(Soldering, 10 seconds) .............................. 300°C
COMMENT
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and the functional operation of
the device at these or any other conditions above those
indicated in the operational sections of this specification is
not implied. Exposure to absolute maximum rating condi-
tions for extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
Temperature
Min.
Max.
Commercial
Industrial
Military
0°C
–40°C
–55°C
+70°C
+85°C
+125°C
3815 PGM T12.1
Supply Voltage
X22C10
Limits
5V ±10%
3815 PGM T13
D.C. OPERATING CHARACTERISTICS (Over the recommended operating conditions, unless otherwise specified.)
Limits
Symbol
lCC
Parameter
VCC Supply Current,
RAM Read/Write
ISB1 VCC Standby Current
(TTL Inputs)
ISB2 VCC Standby Current
(CMOS Inputs)
ILI
ILO
VlL(2)
VIH(2)
VOL
VOH
Input Leakage Current
Output Leakage Current
Input LOW Voltage
Input HIGH Voltage
Output LOW Voltage
Output HIGH Voltage
Min.
–1
2
2.4
Max.
40
2
100
10
10
0.8
VCC + 1
0.4
Units
mA
mA
µA
µA
µA
V
V
V
V
Test Conditions
CS = VIL, I/Os = Open, All Others =
VIH, Addresses = 0.4V/2.4V Levels @
f = 8MHz
Store or Recall Functions Not Active,
I/Os = Open, All Other Inputs = VIH
Store or Recall functions Not Active,
I/Os = Open, All Other Inputs =
VCC –0.3V
VIN = VSS to VCC
VOUT = VSS to VCC
IOL = 4.2mA
IOH = –2mA
3815 PGM T02.3
CAPACITANCE TA = +25°C, f = 1MHz, VCC = 5V
Symbol
Parameter
CI/O(1)
CIN(1)
Input/Output Capacitance
Input Capacitance
Notes: (1) This parameter is periodically sampled and not 100% tested.
(2) VIL min. and VIH max. are for reference only and are not tested.
Max.
8
6
Units
pF
pF
Test Conditions
VI/O = 0V
VIN = 0V
3815 PGM T03
3